#!/usr/bin/node

const log = console.log;

function Circle(radius){
    this.radius=radius;
    this.diameter=(radius)=>{
          return 2*radius;
            
    }
    this.circumference=(radius)=>{
          return 2*radius*Math.PI;
            
    }
    this.area=(radius)=>{
          return Math.PI*radius*radius;
            
    }

}
module.exports=Circle;
log(module);
